Hi I went through this GRE / CAT product. I understood the motive behind the product and the depth.
My main problem with this is that there is nothing new in this product. what is the diffrentiation? It is just another multimedia version of the same grammar books. At the same time, look at the latest products like Smarten Your English through Success Secrets and Smarten your English through Movies.
Unlike other products, these Smarten Series products are practical, you never get bored because you are not studying, you are automatically, unknowingly improving your skills. The skills you can use even beyond GRE. That is the easy and most natural way of skill-building. I believe so.
As a successful CAT candidate, I have a request to the developers. The product(or the learnign from that product) should be useful to us even after the exams. That is the reason, I got hooked to the Smarten Series of English skill-building products.
You can even discuss, argue to a point in front of an audiance, friends etc with the matter you study from these Smarten your English products.